Kinda Makes Me Mad
- Thread starter York Racing
- Start date
For some reason I really doubt he is running 228psi compression and running contemporary fuels.....on top of that it's stupid to run that much compression on an "MX machine".
It was ran on vp c16 and amzoil, the machine was originally built for mx. Then the guy got out of mx and started doing flat track/ice racing and drags with it.. 228 comp was insane! It was pretty much no fun to have to have him be pull started since none of us could kick start it... I tried once, it kicked back blew the bottom of my boot out, and kicked my leg back so hard my knee smashed into the bars, I had a bruise for 2 weeks!!!
Idk if the honda 450s are that much slower but I out ran a few with my lt250r I by out ran I'm talkin 4-6 lenghts! And my lt250r was mild
Idk if the honda 450s are that much slower but I out ran a few with my lt250r I by out ran I'm talkin 4-6 lenghts! And my lt250r was mild
You are mistaken. DirtWheels just ran an article pitting the TRX450 vs the old 250r both piped but unported and the 450 was only a few feet ahead.
Yes I know your talking the LTR but they are all the same. Add porting to the 250r and you have the same HP but less weight.
50hp in both with the R's 324lbs vs the LTR's portly 368lbs.
You realize all the 250cc dirtbikes are making high 40's-50hp stock off the floor right?
My bud has a 99 yz250 and he claims it's about 50-55hp stock, and he had a 87 cr250 that was the first year of the power valve and i think he claimed that had 40's-45hp and i think ha also claimed the 86 cr250 had a attack valve or something like that had less hp then the 87.... SO a 250r motor that is a none power valve from the earley 80's can not be compared to a 250cc 2 stroke from 2011.... But give me a 265r power valve big bore kit...
A power valve doesn't add one bit of HP it just adds more HP down low for broader torque curve.
Point being a 250r ported and piped WILL make 50hp easy.
NEVER CLAIMED it added one bit of HP!!!! The power valve allows you to build a motor with more top end hp with out loosing as much bottom end power, so that is one reason why the power valve motors came with more hp stock....
Also Nac's racing claims that the LRD pipe and silencer gives you 48'8hp @ 7200rpm on the 250r but they also claim the LRD gives 24hp @7200rpm on a blaster..lol
I dont think it takes a lot to build a 250r to run with 450s...
the correct term is atac valve.... on the early 80s cr's it was a exturnal valve on the exhaust that opened and closed like a power valve to do the exact same thing internal valve do.. i had a 84 cr125 with it
also... learly 90s to present bikes ..250cc do make mucho power
and as for a 250r not out performing a ltr .. why is the trx250r banned from ama mx?? because its suppiroir to all else.. it was ahead of its time in its day... and alot of it is still used today
and as for a 250r not out performing a ltr .. why is the trx250r banned from ama mx?? because its suppiroir to all else.. it was ahead of its time in its day... and alot of it is still used today
Thanks for the correction.. I knew it was something like that...lol
Do you know what years and the name of the the valve thing on older 125's connected to the pipe by the cylinder that worked like a power valve, and they came off with the pipe and got pitched when you put on a new pipe???
that would be the atac the 125s had it and so did the 250s.. like i said my 84 cr125 had it...
OK so the thing i saw on the cr250 may not a atac valve because it looked more like it was in the cylinder.. All i remember is that the dude made a big deal that his cr250 was faster because it has a better power valve and it was like the first year of it ... I may be wrong on the years but the 2 bikes where 1 year apart...
Thanks great video!!! what do you think he was smoking before he did that video??? lol
Dirtwheels also said a stock banshee went 85mph on GPS.
The 250R has a weight advantage but it can't make up a 10hp difference especially in bottom end torque that the 450s rape them in.
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